Quite a few skin conditions might affect the feet and many general skin conditions which affect the whole body might be worse in the feet mainly because of the use of footwear and especially the stresses which runners put on the feet.
Blisters are frequent on the feet of runners. Blister are because of superficial friction from your running shoes on particular areas which ends up in your skin cellular layers being split up. This will generally be on the toes or even the rear of the heel bone. The majority of runners are very accustomed to blisters. The obvious way to manage blisters would be to not get them in the first place. Ensure that the running shoes fit appropriately and use a lubricant upon regions of substantial friction. You'll find so many friction reducing tapes or pads which athletes are able to use to avoid blisters should they happen frequently. If a blister should happen, then make sure it is covered and padded allowing it to heal up.
Corns and Callus
Corns and calluses originate from to much stress on a spot. This often is caused by the footwear not fitting correctly or there is some toe or foot deformity triggering higher pressure like a claw toe or bunion. Foot corns and calluses are relatively easy to eliminate. A competent podiatric doctor can easily remove them with debridement. What's not so simple will be to stop corns coming back. Foot corns do not have roots which they grow back from which the podiatrist could not take out. It's really a prevalent myth that corns have roots. Corns and calluses generally come back if the trigger is not really removed and that cause is the high force around the area. This pressure could well be reduced by, for example, surgical treatment to fix a hammer toe or bunions. Foot orthotics should help alleviate force on plantar surface of the foot should there be calluses present.