The rash occurs in different forms, but it usually appears on the skin. The rash is one of the most common symptoms of allergies. they are present throughout the body, but they manifest themselves as skin rash – or localized, can cause a rash at a specific location; on the hand, body, surface of skin and scalp rashes. They often occur after eating a particular food like eggs, milk, soybeans, fish, peanuts and wheat. They can also be triggered by something you’ve touched with the hands, the classic example is poison ivy. These are different types of skin allergy you need to know :

Hives
Urticaria is an inflammatory reaction of the skin manifested by a rash that resembles the sting of nettles: that is red, swollen and it is scratched

Acne
Acne is a dermatosis (skin disease) inflammatory of pilosebaceous follicles (the glands that secrete sebum, the root hairs) with formation of comedones. Typically, it starts at puberty and affects 90% of adolescents, more or less severe. It ceases spontaneously, usually in late adolescence.

The Atopic Dermat (or atopic eczema)
It is a dermatological lesions characterized by dry, scaly and very itchy. The spots usually appear between ages 3 months and 2 years. Approximately 10% of children are concerned. The atopic dermatitis occurs in individuals genetically predisposed to atopy and its manifestations (eg asthma, allergic rhinitis, allergies). In 60% cases, one parent is atopic. One of the predominant factors in the genesis of atopic dermatitis is dry skin.

eczema
Eczema is characterized by lesions shredded (with irregular contours), sometimes microvesicles (acute eczema skin rashes) or dry. These lesions are characterized functionally by intense pruritus (itching).

Psoriasis
The Psoriasis is a skin disease of unclear origin, in part genetic. This dermatological affects 2% of the population.

The epidermis is repeated too quickly, in only four to six days instead of the usual three weeks and this causes localized inflammation. The epidermal cells accumulate on the surface of the skin and form a layer of white film called dander. Perfectly harmless, it nevertheless has the disadvantage of being unsightly.