Rain scald is a non-contagious skin condition caused by the same bacteria as mud fever (Dermatophilius Congolensis) but the infection is typically found in places along the horse’s neck, back and hindquarters rather than the lower legs.
Affected horses are typically those who are in poor condition or immune suppressed like those diagnosed with Cushing’s Disease. It is often seen in winter months due to consistent exposure to wet and muddy conditions, although it is also seen when horses are over-rugged, due to the excessive sweating this may cause. Rain scald is characterised by scabs that come off with tufts of hair which look like paint brushes. For more information on prevention, diagnosis and treatment follow these links:
The Horse Trust - Common horse problems over the winter months