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Mastocytoma on the paw in a Labrador Retriever. Mast cells are cells of the immune system that play a role in the innate immune response. They produce a number of biologically active substances, including primarily histamine. Mastocytoma account for about one-fifth of all skin tumors in dogs.
Most commonly histiocytomas are found in young dogs and appear as a small, solitary, hairless lump, [6] although Shar Peis may be predisposed to multiple histiocytomas. [7] They are most commonly found on the head, neck, ears, and limbs, and are usually less than 2.5 cm in diameter. [8] Ulceration of the mass is common.
Mast cell tumors are known among veterinary oncologists as 'the great pretenders' because their appearance can be varied, from a wart-like nodule to a soft subcutaneous lump (similar on palpation to a benign lipoma) to an ulcerated skin mass. Most mast cell tumors are small, raised lumps on the skin. They may be hairless, ulcerated, or itchy.
One lump seems to have burst, and it looks hollow in the center. My dog is still energetic, eats well, drinks plenty of water, and loves to play. I'm just worried that all the lumps might burst.
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Lymphoma of the skin is an uncommon occurrence. The epitheliotropic form typically appears as itchy inflammation of the skin progressing to nodules and plaques. The non-epitheliotropic form can have a wide variety of appearances, from a single lump to large areas of bruised, ulcerated, hairless skin. [8]
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Hemangiosarcoma of the skin usually appears as a small red or bluish-black lump. It can also occur under the skin. It is suspected that in the skin, hemangiosarcoma is caused by sun exposure. [4] Occasionally, hemangiosarcoma of the skin can be a metastasis from visceral hemangiosarcoma.
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