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Hidradenitis Suppurativa

Hidradenitis suppurativa (HS) is a condition that causes painful bumps under your skin in the hair roots near some of your sweat glands. It’s also ...

Hereditary Angioedema (HAE)

A problem with a gene that makes a blood protein called C1 inhibitor often causes HAE. The main symptom is swelling. Swelling in the throat is the ...

Henoch-Schonlein Purpura (HSP)

Approximately two-thirds of the cases of HSP occur days after symptoms of an upper respiratory tract infection develop. Some cases of HSP have been...

Understanding Hair Loss -- The Basics

Hair is made up of a protein called keratin that is produced in hair follicles in the outer layer of skin. As follicles produce new hair cells, old...

Congenital Hypotrichosis

Hypotrichosis is the term dermatologists use to describe a condition of no hair growth. Congenital atrichia or papular atrichia is a unique conditi...

Vitiligo and Loss of Skin Color

Vitiligo is a condition in which white patches develop on the skin. Any location on the body can be affected, and most people with vitiligo have wh...

Sunburn

When you get a sunburn, your skin turns red and hurts. Despite health warnings about sun damage, many of us still subject our skin to the sun's bur...

Psoriasis

Psoriasis is a common skin disorder that forms thick, red, bumpy patches covered with silvery scales. Rashes may itch and skin may become cracked a...

Skin, Pruritus, and Itching

Pruritus simply means itching. Finding the cause of the itching and treating any underlying skin disease is the first step in solving pruritus.

What is a Pilonidal Cyst?

Most doctors think that ingrown hairs are the reason for many of them. Pilonidal means 'nest of hair,' and doctors sometimes find hair follicles in...

Molluscum Contagiosum

Molluscum contagiosum is a common viral skin infection. Molluscum contagiosum causes either single or multiple raised, pearl-like bumps (papules) o...

Moles, Freckles, and Skin Tags

Moles occur when cells in the skin grow in a cluster instead of being spread throughout the skin. A mole or freckle should be checked if it has a d...