**Core Concept**
Primary syphilis is characterized by the appearance of a solitary painless chancre at the site of inoculation, but in rare cases, it can present with primary bullous lesions. This manifestation is not typical of primary syphilis but is seen in another stage of the disease.

**Why the Correct Answer is Right**
The correct answer is associated with secondary syphilis. During this stage, syphilis can manifest with a variety of skin lesions, including maculopapular rashes, papulosquamous lesions, and bullous lesions. Bullous lesions in syphilis are a result of the immune response to the infection, leading to the formation of vesicles and bullae on the skin.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because primary syphilis is typically characterized by a solitary chancre, not bullous lesions.
* **Option B:** This option is incorrect because tertiary syphilis is characterized by the involvement of multiple organ systems, including the cardiovascular and central nervous systems, and is not typically associated with bullous lesions.
* **Option D:** This option is incorrect because congenital syphilis can present with a variety of skin lesions, but primary bullous lesions are not a hallmark of this condition.

**Clinical Pearl / High-Yield Fact**
Bullous lesions in syphilis can be a challenging diagnosis, and a biopsy of the lesion may be necessary to confirm the diagnosis.

**Correct Answer:** C. Secondary syphilis.