A solid bump, 0.2 to 0.4 of an inch in diameter, that may be raised. A nodule sometimes appears to form below the surface of the skin and press upward. A solid bump less than 0.4 of an inch in diameter. Warts, insect bites, skin tags, and some skin cancers are papules. A plaque is a larger papule.
Scales occur with psoriasis, seborrheic dermatitis, and many other conditions.
Scars form after destruction of some part of the dermis. Like an erosion, only deeper, penetrating at least part of the dermis. The causes are the same as for erosions. A small, fluid-filled spot less than 0.2 of an inch in diameter. Swelling in the skin that produces an elevated, soft, spongy area that appears relatively suddenly and then disappears.