What type of cancer is characterized by irregular, crusted and red papules?

The type of cancer characterized by irregular, crusted, and red papules is Squamous cell carcinoma. This skin cancer arises from the squamous cells, which are flat cells located in the outer layer of the skin. One of the defining features of squamous cell carcinoma is that it can present as red, scaly patches or raised, crusted lesions that may bleed or become ulcerated. These papules are often irregular in shape and can vary in size, which aligns with the description provided.

While melanoma is another type of skin cancer, it typically presents as irregularly shaped moles or spots that can be multicolored, rather than specifically as red, crusted papules. Malignant growth is a more general term and does not specify the characteristics that define squamous cell carcinoma. Vitiligo, on the other hand, is a skin condition characterized by the loss of pigmentation rather than the development of crusted or papular lesions. Therefore, the clarity and specific characteristics associated with squamous cell carcinoma make it the correct answer to this question.