Yes! Keep using your Tretinoin.Tretinoin has the most science behind it ad far as skin care products are concerned. Not only do you notice visual improvement in skin tone, acne breakouts and texture - but tretinoin is also proven to help reverse the signs of aging and help stimulate collagen. You may want to consider a laser treatment to help with the discoloration from your acne scars. Sunscreen is also very important!
Thank you for your question. After looking at your photos, the dark red marks you are referring to look like post-inflammatory hyperpigmentation. Tretinoin may help lighten those areas but it takes months, and there are alternative treatment options that are more effective in treating hyperpigmentation. Options include lightening creams such as hydroquinone, or chemical peels, or laser treatments. The right modality for you depends on your skin type, expectations, patience, downtime, and cost. I recommend you continue tretinoin, as the medication will continue to treat your acne, and I highly suggest you consult with a board certified dermatologist to discuss treatment options that best suit your needs. Take care and good luck.