A common, mild skin disorder in which a rash of flat, scaly-edged, pink spots or patches appears on the trunk and upper arms. It is not contagious and mainly affects children and young adults. Its cause is unknown. The rash lasts for 4–8 weeks, may cause itching, and usually clears up without treatment. Calamine lotion or antihistamine drugs may relieve any itching. pityriasis versicolor A common skin condition in which patches of white, brown, or salmon-coloured flaking skin appear on the trunk and neck. Also known as tinea versicolor, it is caused by a fungus that exists on most people’s skin. Treatment is with antifungal drugs. pivampicillin See penicillin drugs. pivmecillinam See penicillin drugs. pizotifen An antihistamine drug used to prevent migraine in people with frequent, disabling attacks. Adverse effects can include nausea, dizziness, drowsiness, dry mouth, and muscle pains.
Prolonged use may cause weight gain.
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