The affected area turns white-yellow or yellow-brown and the nail may thicken, develop a crust and the surrounding area may become red and swollen, causing discomfort. The nail can also become pitted and misshapen with grooves or ridges appearing and it could crumble and separate from the nail bed. The thickening, discolouration and irregularities are plainly visible and in some cases an infection can develop causing the skin to ooze pus. As there are a number of conditions that can look like a fungal nail infection, it is important to get a correct diagnosis by a specialist. At Beauchamp Foot Care if we are uncertain as to the cause of your condition, our podiatrists will arrange for a nail sample to be sent away for analysis. The effects of onychomycosis aren't only aesthetic. Affected nails may loosen and fall off and misshapen nails could cause you pain if they rub on the inside of your shoes.