I know someone with Lyme and Reynauds -- are the two conditions connected somehow?
Welcome Easy. I get this too only mine moves around. I'll get red, hot fingers or toes, or just one extremity. I can also get cold, pale, white extremities too. Mine is Raynaud's syndrome. It is vascular but not serious. I don't know if this is what you have but you could google it and read on it. It usually isn't in just one hand though.