<unk>  is one of the many forms of dermatitis.  Also known as discoid dermatitis, it is characterized by round or oval-shaped itchy lesions. (The name comes from the Latin word "nummus," which means "coin.")
Nummular dermatitis
Xerotic eczema
Phytophotodermatitis
Alopecia mucinosa
Acroangiodermatitis
Sycosis vulgaris
Ichthyosis bullosa of Siemens
Actinic prurigo