What is a small epidermal cyst that typically appears as a firm white papule?

A small epidermal cyst that appears as a firm white papule is referred to as millia. Millia are tiny keratin-filled cysts that can occur when skin cells do not shed properly, leading to a buildup beneath the skin's surface. They are typically small, round, and white or yellowish in color, making them quite distinguishable and easy to identify.

In contrast, warts are caused by a viral infection and have a rough texture. Comedones are clogged hair follicles, commonly referred to as blackheads or whiteheads, and vary in appearance. Psoriasis is a chronic autoimmune condition characterized by red patches with silvery scales, not small white papules. Understanding the specific characteristics and underlying causes of these skin conditions is vital for accurate identification and treatment.