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2 1 Morphology of Skin Lesions
Fig. 1.1 Multiple macules
Fig. 1.2 Patch
1 Morphology of Skin Lesions 3
Fig. 1.3 Multiple papules
Fig. 1.4 Plaques
4 1 Morphology of Skin Lesions
Fig. 1.5 Vesicles
Fig. 1.6 Tense bulla
Fig. 1.7 Flaccid bulla
1 Morphology of Skin Lesions 5
Fig. 1.8 Pustules
Fig. 1.9 Nodule
6 1 Morphology of Skin Lesions
Fig. 1.10 Ulcer
Wheal: A wheal is an edematous, well-defined papule or plaque seen in urticaria
that usually lasts less than 24 hours. It is also called hive (Fig.
1.11).
Petechiae: Petechiae are non-blanchable spots on skin or mucosa that measure less than 2 mm in size (Fig.
1.12).
Purpura: A purpura is a non-blanchable spot on skin or mucosa that measure 2 mm or greater in size (Fig.
Scale: A scale is a flat plate or flake of stratum corneum (Fig.
1.13).
1.14).
Excoriations: Excoriation is a loss of skin usually in a linear fashion occurring commonly as a result of scratching (Fig.
1.15).
The presence of excoriations suggests that the skin condition that patient has is
probably very itchy.
Erosion and Crust: Erosion: Loss of only epidermis without an associated loss of underlying dermis (Fig.
1.16).
Crust: It is dried fluid such as blood, serum or pus or a combination on the skin’s
surface (Fig.
1.17).
Lichenification: Lichenification is featured by thickening and accentuation of the skin creases. It is usually a result of repeated scratching or rubbing of the skin
1.18).
(Fig.
Atrophy: Atrophy of the epidermis appears as ‘cigarette-paper’ like wrinkling. Atrophy of the dermis causes a depression in the lesion (Fig.
1.19).
Fissure: A fissure is formed due to dryness or excessive tension of the underlying tissue. It manifests as loss of continuity of the skin or mucosa in a linear fashion
1.20).
(Fig.
1 Morphology of Skin Lesions 7
Fig. 1.11 Wheal
Fig. 1.12 Petechi
8 1 Morphology of Skin Lesions
Fig. 1.13 Purpura
Fig. 1.14 Plaque of
psoriasis adherent with scales
1 Morphology of Skin Lesions 9
Fig. 1.15 Excoriation. See the linear lesion
Fig. 1.16 Multiple erosions
10 1 Morphology of Skin Lesions
Fig. 1.17 Several crusts
Fig. 1.18 Lichenified
plaque
Bibliography 11
Fig. 1.19 Dermal atrophy
Fig. 1.20 Fissure seen on
the middle third of index finger

Bibliography

Amerson EH, Burgin S, Shinkai K. Fundamentals of clinical dermatology: morphology and special
clinical considerations. In: Kang S, Amagai M, Bruckner AL, Enk AH, Margolis DJ, McMichael AJ, Orringer JS, editors. Fitzpatrick’s Dermatology, 9e. McGraw-Hill Education; 2019.
McGrath A, Barrett MJ. Petechiae [Internet]. PubMed. Treasure Island (FL): StatPearls Publishing;
2020. Available from
Wheal [Internet]. www.dermweb.com. Available from http://www.dermweb.com/morphology/whe
al1.htm.
https://www.ncbi.nlm.nih.gov/books/NBK482331/.