Not contagious
Scientists still don't know exactly what causes Psoriasis, they do know that the immune system and genetics play major roles in its onset. Usually something triggers psoriasis then the skins cells grow at an abnormally fast rate, which causes lesions. It is not a contagious disease.
One of the most common places for Eczema to develop is the scalp. The most common type of scalp eczema is known as seborrheic dermatitis and its most well known symptom is dandruff. It not contagious its often embarrassing for the individual suffering from the condition.
Contagious
Shingles blisters can cause a sensitive and infected scalp. The infection can result in bald patches if you aren't careful abut how you treat the rash. Shingles are caused by the reactivation of the virus that causes chickenpox. Shingles can be contagious to those who haven't had the chicken pox virus.
Folliculitis is a common skin condition in which hit follicles become inflamed, often as a result of a bacterial infection or a fungal infection. It can spread and turn into non-healing sores and severe infections can cause permanent hair loss and scarring. Although most cases of folliculitis are not contagious, cases cause by infection can be passed between individuals thorough skin on skin contact of the affective areas.
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