Corner of mouth outside is red/painful it cracks and peels no apparent bump/acne/hair follicle etc sometimes goes almost all away then comes back?

Angular cheilitis: Multifactorial disorder of infectious origin. The sores are often infected with fungi (yeasts), or sometimes bacteria, or both. Several nutritional deficiency states of vitamins or minerals have been linked to AC. It is thought that in about 25% of people with AC, iron deficiency or deficiency of B vitamins are involved. Keep a good oral hygiene, try to eat healthier and take a good multi-vitamin.