Are you sure it's a fungus? I have sun spots from tanning. Those don't really go away, but I've never really contacted a dermatologist about them before.
Here's some info:
WHAT ARE AGE, SUN OR LIVER SPOTS? They are light or dark brown spots on the tops of the hands, face, shoulders, chin, upper chest, and any other areas that are or have been chronically exposed to the sun. As we age, chronic sun exposure alters the function of the cells in the skin. The melanocytes (melano = "color," cyte = "cell") that arise from the basal layer of the epidermis produce the color-bearing pigment called melanin. As the production of melanin becomes irregular and sporadic, pigment clumps together, causing brown spots that give the skin a mottled or blotchy appearance. To appreciate the harmful effects of the sun, simply compare the smooth, unblemished skin on the breasts and buttocks or other areas of the body that are always covered by clothing to the irregularly pigmented skin in sun-exposed areas. Even if you had a facelift, these spots remain making you appear a lot older. These spots are not removed with your facelift! Pulsed Light can reverse years—even decades— of sun damage