How can I differentiate between a plantar wart and melanoma?

Doctor's Answers 1

Plantar warts are small and will grow on the heels or other areas of your feet that are often put to pressure. Whereby the pressured area will form a thick and hard layer of skin, causing plantar warts to grow inward beneath this skin. Because of this, skin lesions may appear.

Plantar warts are caused by HPV. The virus enters your body through tiny cuts, breaks or other weak spots on the bottom of your feet.

Melanoma is a type of skin cancer. In most cases, it affects areas that have had exposure to the sun. This is such as your back, legs, arms and face. That said, it can also affect some 'hidden' areas such as the soles of your feet, palms of your hands, eyes, intestines and fingernail beds.

A common sign of melanoma is abnormal changes in an unusual mole. These abnormalities can include:

  • Colour: normal moles have a uniform colour (tan, brown, or black) whereas an unusual mole can have an uneven distribution of colours. The colour may also change over time.
  • Shape: most normal moles are oval or round. If you see an asymmetric mole, it might be best to visit your doctor
  • Diameter: moles that are a sign of melanoma tends to be big and is actively growing over time

Do see your dermatologist soon for a full assessment and treatment. In the case of plantar warts, active treatment is recommended as viral warts may increase in size and may spread to other areas and may also infect other people. For melanoma, the chances of recovery are much higher and less invasive in the early stages.

Similar Questions

What are other symptoms of melanoma besides irregular moles?

A melanoma may develop from a normal mole which then changes over time. A melanoma normally changes in shape, size and colour, sometimes slowly or sometimes very quickly. If a mole becomes very black, bleeds or have irregular borders and different colours within, do speed-dial your dermatologist office for an appointment.

Photo of Dr Stephanie  Ho

Answered By

Dr Stephanie Ho

Dermatologist

For treatment of a plantar wart, how long can I apply salicylic acid for before seeking alternative treatment, such as cryotherapy? (photo)

Thanks for the question. First, it is important to confirm the diagnosis of a viral wart. Callosities of the foot can also present with thickened skin on the soles and can look very much like a viral wart. Salicylic acid can be used to treat viral warts. If the wart is persistent after 2 to 3 months of treatment or progressing in size, you can consider alternative treatments. Cryotherapy or freezing the wart with liquid nitrogen is an alternative treatment that is commonly used to treat viral warts. Usually, a few sessions spaced weekly or fortnightly will be required.

Photo of Dr Colin Theng

Answered By

Dr Colin Theng

Dermatologist

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