A growth near or under your fingernail can develop from a variety of ailments and skin infections. While many blister-like growths are diagnosed as minor infections, it is possible you are suffering from a more serious ailment, such as skin cancer. Consult your doctor for a diagnosis of your condition.
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A staph infection is a direct result of bacteria -- usually staphylococcus aureus -- finding its way into your body. Individuals who suffer from staph infections usually develop them because they have a weak immune system, or because they are staph carriers. Individuals with weak immune systems may be recovering from an illness or have a chronic disease. Diabetes, cancer and vascular and lung diseases can all affect your immune system. If the staph infection is under or near fingernails, it will appear as a boil, a pus-filled blister or a vesicle that can burst.
Warts are growths found on the skin, often on the fingers and toes. Warts are caused by the HPV virus, which fosters rapid cell growth in your skin. A wart near or under your fingernail will often appear rough and flesh-colored, possibly developing in a cluster of several growths. If you pick a wart, it will bleed and grow back over the course of several days.
A fungal infection under or near a fingernail usually manifests itself in individuals with weaker immune systems or those who are constantly exposing their hands to warm water. Once present in your fingers, the fungal infection will cause discoloration and a blister-like growth that can swell and be painful. Antibiotics are used to treat the infection.
There are four types of melanoma, three of which start as tumors on the outside layer of your skin. If a blister-like growth develops on or near your fingernails, it may be melanoma. A melanoma appears as a slightly raised bump on that skin that is discolored and looks similar to a blood blister. The edges of a melanoma are irregular. A melanoma can be the direct result of excessive sun or UV exposure. While advanced melanoma can be lethal, the prognosis is good if detected in the early stages. Basal cell and squamous cell skin cancer are two other growths that can appear as blisters or sores on your body.