A lump on a rat may be an abscess, cyst or tumour. Its appearance alone does not establish the diagnosis. Arrange a veterinary examination rather than trying a dietary remedy first.

Treatment decisions

Rats commonly develop tumours. A vet may recommend removal, and earlier assessment can improve the options available. Treatment should reflect the diagnosis and the individual animal’s condition.

What will it cost?

Ask the treating practice for an itemised estimate. The old dollar amounts were not a verified current UK price guide and have been removed.

Correction

The inherited “80%” home-remedy claim had no supporting reference. It and the advice to treat growths with flaxseed and yoghurt have been removed.

Sources checked

Replacement copy checked on 2026-11-08. This is a source-based editorial review, not independent veterinary review.