Papules: Definition, Common Causes, and When to See a Doctor

A papule is a solid, elevated skin lesion <1 cm in diameter with no visible fluid. It can be felt as a small bump.

Common Causes

• Acne vulgaris: Inflammatory papules (red bumps).
• Warts (verrucae): HPV-induced hyperkeratotic papules.
• Moles (nevi): Pigmented papules, usually benign.
• Insect bites: Pruritic, erythematous papules.
• Contact dermatitis: Allergic or irritant reaction.
• Lichen planus: Violaceous, flat-topped, itchy papules.
• Drug eruptions: Morbilliform or urticarial papules.

When to Seek Medical Evaluation

Consult a dermatologist if a papule:

• Does not resolve in 2–4 weeks.
• Changes in size, shape, color, or texture.
• Bleeds, ulcerates, or becomes painful.
• Is accompanied by systemic symptoms (fever, joint pain).
• Has features of skin cancer (asymmetry, irregular border, color variation, diameter >6 mm, evolution).

Early evaluation of suspicious lesions improves outcomes for conditions like melanoma or squamous cell carcinoma.