Some have suggested it looks like a "roast chicken'' or an "alien,'' but Mrs Stephens has her own view.

"I think it looks like ... a jester's hat,'' Mrs Stephens said.

NSW Department of Primary Industries citrus expert Sandra Hardy said the lemon's condition was clearly a case of bud mite.

"Bud mites feed on buds and fruitlets causing deformed or grotesquely shaped fruit,'' Ms Hardy said.

"Lisbon lemons are especially susceptible.''

Mite infestations often occur between September and February and can be controlled using oil sprays to reduce the mites' ability to feed and lay eggs.

Have you seen any ''deformed'' lemons?