The most common types of skin rash include seborrheic dermatitis, eczema, heat rash and poison ivy. Also common are rashes caused by infections such as fungal, bacterial, parasitic and viral infections, according to MedicineNet.com. Other common types of rashes are caused by hives, shingles, contact dermatitis, ringworm, psoriasis and impetigo.
There are many different types of skin rash as well as a variety of factors that can cause a skin rash to occur, including immune system disorders and medications, as stated by Mayo Clinic. The most common rash is eczema, which is a medical condition in which patches of skin become rough and inflamed, with blisters that cause itching and bleeding, according to WebMD.