Flaking or scaling of skin.Encyclopedia Entry for Pityriasis :Pityriasis versicolor- Tinea versicolor- Malassezia furfur (fungus)Encyclopedia Entry for Pityriasis :Pityriasis alba. The cause is unknown but may be linked to atopic dermatitis (eczema). The disorder is most common in children and teens. It is more noticeable in children with dark skin.The problem areas on the skin (lesions) often start as slightly red and scaly patches that are round or oval. They usually appear on the face, upper arms, neck, and upper middle of the body. After these lesions go away, the patches turn light-colored (hypopigmented). The patches do not tan easily. Because of this, they may get red quickly in the sun.The health care provider can usually diagnose the condition by looking at the skin. Tests, such as potassium hydroxide ( KOH ), may be done to rule out other skin problems. In very rare cases, a skin biopsy is done.The provider may recommend the following treatments: Moisturizer Mild steroid creams Medicine, called immunomodulators, applied to the skin to reduce inflammation Treatment with ultraviolet light to control the inflammation Medicines by mouth or shots to control the dermatitis, if very severe Laser treatment.Pityriasis alba usually goes away on its own with patches returning to normal pigment over time.Patches may get sunburned when exposed to sunlight. Applying sunscreen and using other sun protection can help prevent sunburn.Call your provider if your child has patches of hypopigmented skin.Pityriasis rubra pilaris on the chest Pityriasis rubra pilaris on the chest.Habif TP. Light-related diseases and disorders of pigmentation.Encyclopedia Entry for Pityriasis :Pityriasis rosea. Pityriasis rosea is believed to be caused by a virus. It occurs most often in the fall and spring. Although pityriasis rosea may occur in more than one person in a household at a time, it is not thought to spread from one person to another.Attacks most often last 4 to 8 weeks. Symptoms may disappear by 3 weeks or last as long as 12 weeks. The rash starts with a single large patch called a herald patch. After several days, more skin rashes will appear on the chest, back, arms, and legs. The skin rashes: Are often pink or pale red Are oval in shape May be scaly May follow lines in the skin or appear in a 'Christmas tree' pattern May itch.Your health care provider can often diagnose pityriasis rosea by the way the rash looks. In rare cases, the following tests are needed: A blood test to be sure it is not a form of syphilis, which can cause a similar rash A skin biopsy to confirm the diagnosis.If symptoms are mild, you may not need treatment. Your provider may suggest gentle bathing, mild lubricants or creams, or mild hydrocortisone creams to soothe your skin. Antihistamines taken by mouth may be used to reduce itching. You can buy antihistamines at the store without a prescription. Moderate sun exposure or ultraviolet (UV) light treatment may help make the rash go away more quickly. However, you must be careful to avoid sunburn.Pityriasis rosea often goes away within 6 to 12 weeks. It usually doesn't come back.Call for an appointment with your provider if you have symptoms of pityriasis rosea.Rash - pityriasis rosea; Papulosquamous - pityriasis rosea.Pityriasis rosea on the chest Pityriasis rosea on the chest.Habif TP. Psoriasis and other papulosquamous diseases.Encyclopedia Entry for Pityriasis :Pityriasis rubra pilaris. There are several subtypes of PRP. The cause is unknown, although genetic factors and an abnormal immune response may be involved. One subtype is associated with HIV/AIDS.PRP is a chronic skin condition in which orange or salmon-colored scaly patches with thick skin develop on the hands and feet. The scaly areas may cover much of the body. Small islands of normal skin (called islands of sparing) are seen within the areas of the scaly skin. The scaly areas may be itchy. There may be changes in the nails. PRP can be severe. Although it's not life threatening, PRP can greatly reduce quality of life and limit activities of daily living.The health care provider will examine your skin. Diagnosis is usually made by presence of the unique skin lesions. (A lesion is an abnormal area on the skin). The provider may take samples ( biopsies ) of the affected skin to confirm the diagnosis and rule out conditions that may look like PRP.Topical creams containing urea, lactic acid, retinoids, and steroids may help. More commonly, treatment includes pills taken by mouth such as isotretinoin, acitretin, or methotrexate. Exposure to ultraviolet light (light therapy) may also help. Drugs that affect the body's immune system are currently being studied and may be effective for PRP.These resources can provide more information on PRP: National Organization for Rare Disorders -- rarediseases.org/rare-diseases/pityriasis-rubra-pilaris.Call your provider if you develop symptoms of PRP. Also call if you have the disorder and symptoms worsen.PRP; Pityriasis pilaris; Lichen ruber acuminatus; Devergie disease.Pitted keratolysis Pitted keratolysis Pityriasis rubra pilaris on the chest Pityriasis rubra pilaris on the chest Pityriasis rubra pilaris on the feet Pityriasis rubra pilaris on the feet Pityriasis rubra pilaris on the palms Pityriasis rubra pilaris on the palms Pityriasis rubra pilaris - close-up Pityriasis rubra pilaris - close-up.Eastham AB, Femia AN, Qureshi A, Vleugels RA. Treatment options for pityriasis rubra pilaris including biologic agents: a retrospective analysis from an academic medical center. JAMA Dermatol. 2014;150(1):92-94. PMID: 23986433 www.ncbi.nlm.nih.gov/pubmed/23986433. James WD, Berger TG, Elston DM. Pityriasis rosea, pityriasis rubra pilaris, and other papulosquamous and hyperkeratotic diseases.