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.
At first, a pityriasis rosea rash appears as a small pink or rose-colored discoloration if your skin is light-colored. On dark skin, the color of the rash may be less pronounced or appear gray or violet.This early rash, sometimes called a herald patch, is usually no more than four inches in diameter.Eventually, though, pityriasis rosea can spread and create oval-shaped patches all over the body.These patches of skin may feel scaly. People who have pityriasis rosea often develop a rash on their back in the shape of a Christmas tree.n dark skin, the color of the rash may be less pronounced or appear gray or violet. This early rash, sometimes called a herald patch, is usually no more than four inches in diameter. Eventually, though, pityriasis rosea can spread and create oval-shaped patches all over the body.