A cavernous hemangioma happens when capillaries small blood vessels that connect arteries and veins -swell and form a noncancerous mass called an angioma. In reality, cavernous hemangiomas are slow-flow venous malformations, not true vascular tumours. They are categorized as hamartomas. According to reports, Vascular Malformations can manifest itself anywhere, including the skin and subcutaneous layers of the head and neck, face, limbs, liver, gastrointestinal tract and even the thymus. Here we report a rare case of thrombosed cavernous hemangioma over the right arm in a 7-year-old since birth, discussing the diagnostic aspects and treatment modalities of such a lesion. This is the first report of its kind in English literature, to the best of our knowledge.