Focal, elevated, solid, circumscribed, palpable increase in substance of skin, sharp borders, surface usually smooth.
Colors: if caused by inflammation, red; if secondary to other deposits: red, brown or yellow.
Size: ≤ 1 cm.
May appear on entire body, for example maculo-papular exanthem.
Papules may coalesce to form plaque.
Papule may enlarge to form nodule.
May develop scales, crusts or erosion.
May be associated with: macule (maculo-papular), vesicle (papulo-vesicular) or pustule (papulo-pustular).
Comment / Explanation
Distinguish from nodule which is >0.5 cm.
Inflammatory papules often pruritic.
Multiple lesions: Drug exanthema, lichen planus, scabies, syphilis, acne.
Single lesions: Melanocytic nevus, tumors such as early nodular basal cell carcinoma.
Inflammatory infiltrate, deposits of lipids, proliferations of cells.