Dermatology

Hematidrosis, also calledblood sweat is a very rare condition in which a human sweats blood.

Lithium succinate, the lithium salt of succinic acid, is a drug used in the treatment of seborrhoeic dermatitis and proposed for the treatment of anogenital warts.

The epidermis is the outer (epi in Greek meaning "over" or "upon") of the two layers that make up the skin (or cutis), the inner layer being the dermis.

Nail biting, also known as onychophagy or onychophagia, is an oral compulsive habit.

Nevus, also known as a mole, is the medical term for sharply circumscribed and chronic lesions of the skin or mucosa.

Dermatographic urticaria (also known as dermographism, dermatographism or "skin writing") is a skin disorder and one of the most common types of urticaria affecting 4–5% of the population.

Freckles, sometimes called ephelides (singular ephelis), are clusters of concentrated melaninized cells which are most easily visible on people with a fair complexion.

Sun tanning or simply tanning is the process whereby skin color is darkened or tanned.

The dermis or corium is a layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that primarily consists of dense irregular connective tissue and cushions the body from stress and strain.

A pimple, zit or spot is a kind of comedo and one of the many results of excess oil getting trapped in the pores.

Becaplermin (brand name Regranex) is a cicatrizant, available as a topical gel.

Verrucous lupus erythematosus (also known as "Hypertrophic lupus erythematosus") presents with non-pruritic papulonodular lesions on the arms and hands, resembling keratoacanthoma or hypertropic lichen planus.

Actinic keratosis (also called "solar keratosis" and "senile keratosis"; abbreviated as "AK") is a pre-cancerous patch of thick, scaly, or crusty skin.