The following would help you :
1. Daily use of gel based sunscreen in day time of SPF 30 applied half hour before sun exposure to prevent darkening of spots.
2. Daily bed time use of retinoid cream
3. Evaluation by dermatologist - procedures / peels - salicylic acid Peel if needed
4. Procedures like microneedling rf, fractional lasers or just microneedling for scars are helpful and necessary. Chemical peels for acne and spots.
5. Kindly read my blog on daily skin care on Practo health feed. Daily fitness work out and loads of fruits and veggies will help loads in improving your skin.
You may Send further queries/ pics of lesions on private follow up chat.
Hope this helps.