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 rosea is a common rash usually seen in individuals between 10-35 years of age. The rash typically lasts six to eight weeks, rarely extending 12 weeks or longer. Once a person has pityriasis rosea, it generally does not recur in their lifetime. Pityriasis rosea begins as a single, large pink patch found on the trunk called the herald patch.. 2  The herald patch is followed one to two weeks later with smaller pink patches in a Christmas tree configuration.