The first area of concern is the possibility that you have completely healed now and whether the scars that you have are on the wane. The redness after sores is usually because the capillaries that supply blood to the surface of the skin can be seen. Sores that were previously filled with a serous liquid usually have this effect on the skin after deflation. If these are left alone, they will go away as new skin layers build up underneath but this is a time consuming process.
A similar problem is faced by people with acne problems as well. There is a form of acne that leaves behind red spots as scars; these can sometimes remain for life. At the end of the day, these are scars and the only way to treat them is through minor surgical procedures. Most surgery for getting rid of scars is based on the principle of destroying the scar tissue by either burning it off or rubbing it off. The body then heals this damaged skin with collagen, which gives it the texture of normal skin again, but for this to happen the damage caused has to be controlled so as not to encourage the growth of scar tissue again. Before getting any kind of treatment done, it is probably a good idea to make your face as sterile from bacteria or fungi as possible. One of the best topical treatments that you could use for this is diluted tea tree oil. The sterilization is advised because any remaining bacteria from your skin infection should be destroyed lest they aggravate the condition because of braised skin.
To follow any of these treatments, you will have to visit a cosmetic surgeon. Though one form of getting scarring removed is, a method called needling, this is not advised for areas of the face and especially since you already had a skin infection. Your skin has probably taken enough punishment and needling might not be the best solution. The other solutions that the cosmetic surgeon would put forward are laser therapy, dermabrasion, and cryotherapy. Laser therapy involves shooting a laser out at the spots and killing the skin off. This is done at a microscopic level, stimulating collagen formation in the healing process. Dermabrasion requires that a mechanical device be used to rub the skin right off. This is done under a general anesthetic and is quite painful. Cryotherapy, works using the principle similar to laser therapy as well but the difference lies in how the damage is made to the surface of the skin. Cryotherapy freezes the area of the skin, leading to the formation of new skin.