Final answer:
Postoperative scarring can sometimes be mistaken for carcinoma, but it does not form a solid central tumor, and it may be associated with skin thickening, such as in the case of keloids. Therefore, the correct answer to the question is A (1 only).
Step-by-step explanation:
The question relates to postoperative scarring and its potential characteristics that could be confused with carcinoma. Postoperative scarring sometimes can indeed be mistaken for carcinoma due to certain similarities in appearance. Yet, postoperative scars do not typically form a solid, dense central tumor as carcinomas might. Instead, they are made of collagen-rich fibrous tissues that differ from normal skin structure. Scarring is associated with repairs on the skin that doesn't regenerate the original skin structure completely. Therefore, keloid and atrophic scars do not present a solid, dense central tumor as option 2 suggests. Furthermore, while keloids are raised, they can lead to skin thickening, contradicting option 3 which claims no association with skin thickening or dimpling over the lesion.
Regarding squamous cell carcinoma, it affects squamous cells in the epidermis, often appearing as a red nodule or a flat lesion with a scaly surface. Basal cell carcinoma, on the other hand, may appear similar to scars, but they generally present as uneven patches, bumps, or growths on the skin surface.
Hence, the accurate statement about postoperative scarring is that it can sometimes be mistaken for carcinoma, making option A (1 only) the correct answer.