From the symptoms the possibility of dermatitis skin, eczema
, jock itch need to be ruled out. The feeling of ants crawling can be due to parasthesia also. Parasthesias are common in alcoholics and metabolic disorders like diabetes, hypothyroidism, and hypoparathyroidismThey can also be due to peripheral vascular disease, vitamin B12 deficiency or malnutrition.
Get your blood sugar and thyroid hormones levels evaluated.