I have a rash on the corners of my mouth, sore lips which is often paired with dry, irritated skin.?

For more than a year I have had numerous patches of eczema occur all over my face, hands and body but after time they all seem to fade without any scarring, however, there seems to be a problem with the skin around my mouth and lips. The skin around the corners of my mouth and lips is very irritated and always feel dry, even if it isn't. I have tried numerous moisturisers and creams such as E45, Palmer's Coco Butter, Fucibet, Doublebase and Oilatum to try to relax my skin. I do not wear any face make-up or use any products such as soap, face wash or wet wipes on my face and wash my face with plain water. I do upper lip threading regularly but I avoid the corners of my mouth as it is very sensitive. I have a balanced diet and do not eat much junk. Sometimes, the irritation calms down, but never disappears. It has got so bad that it is scarring the skin around my mouth, becoming dark and my skin is losing its natural look and often feels uncomfortable. I always avoid exposing the area to the sun, dirt or dust. This is really affecting my confidence, help!