Share more images , appearance of black spot around corner of lip are due to some reason.
If it is occur due to increase melaning and lead to hyperpigmentation then it need cream medicine and LASER Treatment
If it occur due to acid reflux or any other pathological it need medicine oral and topical.
If it occur due to low collagen production then it need PRP Treatment.
Next Steps
Do consult with after taking your case I will confirm what is cause then I will suggest correct treatment.
Do vedio call on Practo or message me on insta Jovi_healthcentre
Health Tips
apply sunscreen and tranexamic serum it will reduce melanin production. Take vit C oral daily for a week.