Eczema

Summer eczema is an itchy skin condition caused by stings from the mites. Horses on summer grass are particularly vulnerable. The disorder can occur thoughout the summer, but is espacially harsh in May through September. 

The horse react with an allergic reaction to the mites saliva. The skin changes at the mane, back and tail corresponds to a particular mite (culicoides pulicaris) preferred location on the horse. It is typical that not all horses on the same paddock are attacked by the mites. Summer eczema can not be transmitted from horse to horse.

It is a pronounced disorder in Icelandic horses and ponies, but other horses can also be attacked by the mites. 

Symptoms of summer eczema: 

Hudforandringer i manke- og haleregion

Skin changes in the mane and tail region. 

• Initially redness and the formation of small blisters are seen.
• Next exuding eczema is seen, with leakage of yellowish liquid drying in.
• Intense itching.
• The horse rubs its mane and tail, the hair wears off and the skin is further irritated.
• Deep wounds  can occur on the affected areas.
• If the disease lasts for a long time, the tail hair is almost wourn off and the skin becomes thick and leathery.

Source: Netdyredoktor