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3.5 Pityriasis Versicolor (Tinea Versicolor) 33
– It is caused mainly by yeast. Malasazzia furfur and Malasazzia globosa are the
common species (Saizan and Elbuluk
2022).
– Manifests as well demarcated macules or patches that are either pink or
hyperpigmented (Fig.
3.10) or hypo pigmented (on dark skin).
– There is a fine scaling.
– Besides the trunk, neck and upper extremities can also be involved (Brandi et al.
2019
).
– Asymptomatic.
Fig. 3.10 Pityriasis versicolor
34 3 Papulosquamous Disorders (Skin Disorders with Scales)

3.5.1 Diagnosis

– Clinical findings confirmed with positive potassium hydroxide (KOH) preparation
findings.
– Microscopic examination of scales prepared with KOH shows filamentous hyphae
and globose forms of yeast, a ‘spaghetti and meatballs’ appearance (Saizan and Elbuluk
Wood’s lamp and skin biopsy also help, with the former showing copper-orange
or yellowish-white fluorescence of scales (Ponka and Baddar
2022).
2012).

3.5.2 Management

– Topical selenium sulfide (2.5%) lotion or shampoo, or ketoconazole shampoo
or azole creams (ketoconazole, econazole, micronazole, or clotrimazole) or terbinafine 1% solution.
– Systemic therapy in adults: Fluconazole and itraconazole are options (Karray et al.
).
2022
– Please note the dyspigmentation can persist for months even after infection is
cleared.

3.6 Seborrheic Dermatitis

Seborrheic dermatitis (Fig. 3.11) is a type of endogenous eczema that is manifested with greasy looking scales involving seborrheic areas such as scalp, eyebrows, glabella, nasolabial folds, tip of the chin, front of the chest and pubic area. Please see Chap. of Seborrheic dermatitis.
5 ‘Eczema’ for clinical features, diagnosis and management

3.7 Tinea Corporis 35

Fig. 3.11 Seborrheic Dermatitis
3.7 Tinea Corporis
– It is a superficial fungal infection that is caused by dermatophytes. The lesions
of tinea corporis show central clearing with raised borders. It can have some fine scaling and thus sometimes comes in the differential diagnosis of papulosqu­mous disorders such as pityriasis rosea. Please see Chap. Infections’ for clinical features, diagnosis and management of tinea corporis.
As a summary, Table 3.1 shows salient features of the scaly disorders discussed
above.
6 ‘Common Cutaneous
36 3 Papulosquamous Disorders (Skin Disorders with Scales)
Table 3.1 A summary of salient features of the papulosquamous disorders & other conditions that can mimic them
Skin disorder
Psoriasis Minimal or no itching, distribution: extensors, silvery adherent scales
Lichen planus
Pityriais rosea
Tinea corporis
Seborrheic dermatitis
Subacute LE Minimal or no itching. Distribution: sun exposed parts like outer aspects of upper
Pityriasis versicolor
Salient clinical features
Nail changes (please see the text) Intense itching
Distribution: flexors, violate, flat topped, polygonal papules/plaques Oral mucosa can be involved Nail changes (please see the text)
Minimal or no itching H/O Herald patch with daughter patches is usually present Distribution: commonly involves trunk Peripheral colarette of scaling noted
Itching present. Central clearing and borders are raised. Fine scaling present
Greasy looking scales present in seborrheic areas such as scalp, eyebrows, glabella, nasolabial folds, tip of the chin, front of chest and pubic area
extremities, V area of the chest and upper back Well-demarcated macules or patches that are either pink or hyperpigmented or
hypopigmented (on dark skin). Fine scaling. Asymptomatic. Trunk and upper extremities are commonly involved

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Chapter 4

Vesiculo Bullous Lesions (Blistering Rashes)

Abstract Vesiculo bullous lesions are commonly encountered in primary care. The
notable conditions that present with blisters are the following. This chapter provides clinical tips regarding the diagnosis and management of these conditions.
Contact dermatitis
Insect bites
Herpes simplex
Herpes zoster
Bullous impetigo
Hand foot mouth disease
Bullous pemphigoid
Pemphigus vulgaris.
Keywords Bullous pemphigoid · Pemphigus vulgaris · Blisters · Vesicular rash · Hand foot mouth disease · Insect bites · Herpes simplex · Herpes zoster

4.1 Contact Dermatitis

4.1.1 Diagnostic Tips

– History of exposure to an offending agent such as poison ivy is usually given but
not always.
– Also, patient can sometimes give you prior history of having similar presentation
upon exposure to an offending agent such as poison ivy.
Can be localized or generalized.
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2024 D. K. Yellumahanthi, Manual of Primary Care Dermatology,
https://doi.org/10.1007/978-3-031-68406-7_4
39
40 4 Vesiculo Bullous Lesions (Blistering Rashes)
Fig. 4.1 Contact dermatitis to poison ivy
Blisters can be noticed in acute stages. Presence of blisters in a linear fashion
suggesting contact with an extraneous source along that path, is often present.
Please see a linear lesion near the ulnar border of Fig.
4.1.

4.1.2 Management

Identifying and eliminating the offending agent is the initial step.
Depending on the body area, appropriate topical steroids can be given: For
instance, on the face, desonide 0.05% cream, on the body other than face,
depending on the severity, either hydrocortisone valerate 0.2% ointment or
betamethasone dipropionate 0.05% ointment.
– Oral prednisone for a short duration can be given if the inflammation is extensive.
Please see Chap. 5 ‘Eczema’ for more details on the clinical manifestations,
diagnosis and management of contact dermatitis.

4.3 Herpes Simplex 41

4.2 Insect Bites

– Can be localized or generalized.
– History of exposure to insects may or may not always be elicited.
– The lesions are usually painful to some degree than mere itching.

4.2.1 Management

– In localized cases, topical antibiotics to prevent secondary infection and oral anti-
histamines are usually all that is needed. In more extensive cases, oral antibiotics to
prevent secondary infection and oral steroids may have to be added as appropriate.
4.3 Herpes Simplex
– Caused by Herpes Simplex Virus (HSV) 1 and 2. HSV 1, usually presents as
groups of blisters around the corners of the mouth and HSV 2 on the genitalia.
Primary HSV1 can sometimes be severe leading to Herpetic gingivostomatitis.
– Please keep in mind, inoculated herpes can occur at any site on the body. There-
fore, if grouped vesicles are present locally anywhere on the body, think of the
possibility of herpes.
– Usually associated with pain or tingling sensation.

4.3.1 Management

– There are various regimens that includes either acyclovir or famciclovir or valacy-
clovir. For primary herpetic gingivitis, acyclovir could be a better option. If there
are too frequent flare ups, suppressive therapy with antivirals can be initiated.
– Please see Chap. 6 ‘Common cutaneous infections’ for more details on clinical
manifestations, diagnosis and management of herpes simplex.
42 4 Vesiculo Bullous Lesions (Blistering Rashes)

4.4 Herpes Zoster

– Blistering lesions occur along the dermatome. Therefore, seen in a ribbon shape
or segmentally. The lesions are only on one side of the body and never cross the
midline.
– Pain often precedes the rash by 2–3 days. But, can be longer sometimes.
– Rarely, herpes zoster could manifest only as pain along a dermatome without any
skin lesions.
Post herpetic neuralgia (PHN) is the dreaded complication. If significant pain
persists beyond 90 days after the onset of the rash, it is termed as PHN.

4.4.1 Management

Starting antivirals within 72 hours after the onset of rash, helps in reducing the
intensity of acute symptoms of zoster. It is not clear exactly if antivirals also will
benefit in reducing the chances of developing PHN. The following are the various
regimens of antivirals used in adults:
Valacylovir 1000 mg orally three times daily for 7 days. Famciclovir 500 mg orally three times daily for 7 days and Acyclovir 800 mg orally five times daily for seven days (Preferred regimen among pregnant women).
– The acute pain of zoster if not better with oral antivirals, Non Steroid Anti Inflam-
matory Drugs (NSAIDs) and opioids can help. If still not better gabapentin or
pregabalin or a low dose of amitriptyline at bedtime can be tried.
If PHN ensues, it is better to refer the patient to a dermatologist.
– Please see Chap. 6 ‘Common cutaneous infections’ for more details on clinical
manifestations, diagnosis and management of herpes zoster.