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 characteristically begins as an asymptomatic single, large pink, scaly patch called the herald patch or mother patch, measuring 2-10 centimeters. The herald patch is a dry pink to red patch which appears on the back, chest, or neck and has a well-defined, scaly border. 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.