I have this weird rash on both legs that itch when I get hot. The rash extend from my ankle to half way up my leg. It has been there for about a week.

Neurodermatitis. It is not a serious skin problem but to break itch-scratch cycle is challanging. Apply otc hydrocortizone cream and take otc non-drowsy antihistamin tablet by mouth. See your doctor if it does not go away in a week. If you have stress or anxiety that needs to be taken under control sometimes with medication to prevent itching.