What should you know about melanoma horses?

Melanoma is a tumour of pigment-producing cells. It occurs in people and can also occur in animals, including horses, but an animal's diagnosis is not passed to a person by touching, grooming, riding, or sharing a stable. A lump or dark patch on a horse is a veterinary concern; it should be examined by a veterinarian rather than compared with a human mole.

For a person, a new or changing mark may have many causes, from an ordinary mole to irritation or another skin condition. A clinician uses examination and, when needed, biopsy to identify it.

If your concern is a horse, arrange a veterinary examination and avoid squeezing or cutting the lump. If your concern is your own skin, photograph the area for personal comparison, avoid picking it, and book a dermatology or medical assessment. Tell the clinician about change, bleeding, crusting, itching, or injury. A confirmed human melanoma may be managed with Surgical Excision, Skin Cancer Surgery, staging tests, or Immunotherapy.

Seek prompt medical review for a human lesion that grows, becomes uneven in colour or border, bleeds, crusts, or does not heal. Seek urgent help for heavy bleeding, rapidly spreading redness, severe pain, or fever. Seek veterinary advice for a horse with a growing, ulcerated, bleeding, or bothersome lump. Contact with a horse alone is not a reason for emergency care.

Ask what features make your lesion concerning, whether a biopsy is needed, how the sample will be handled, and what follow-up is recommended. If the concern began with an animal's lump, explain exactly what you observed and keep the human and veterinary assessments separate.