Life Cycle. The life cycle of a louse begins as an egg, also called a nit. The nit is a 1mm whitish-yellow speck that attaches itself firmly to an individual hair strand close to the scalp.
Pityriasis rosea is a relatively common skin condition that causes a temporary skin rash of raised, red scaly patches on the body.The rash can be very itchy and usually clears within 2-12 weeks, but on rare occasions can last up to 5 months.ityriasis rosea is a relatively common skin condition that causes a temporary skin rash of raised, red scaly patches on the body.
Pityriasis alba is a disorder which is most often seen in children. It is unknown what the causes of the disease are. Pityriasis alba results in scaly patches of skin. When these scaly patches clear up, a pigmented area is left.Eventually this will return back to normal skin colour.he initial patches caused by pityriasis alba are round, oval or irregular in shape and red or pink in colour. They are also usually scaly and are between 0.5 and 2cm wide. In children, these patches are usually found only on the face and in particular the mouth, chin and cheeks.