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Hello from JustAnswer. This is Dr. Love and I will be glad to assist you.
The most common cause of multiple ulcers on the genitalia would be the first infection of genital herpes. Recurrent infections typically are only one ulcers, but the first manifestation is frequently multiple ulcers. It is also common for a herpes lesion to first be felt as a lump before progressing to a blister or ulcer.
However, genital herpes would be expected to have other associated symptoms, such as pain, burning, or itching. Since you are not having any other symptoms, it would be appropriate to consider whether there is another condition present. For example, it is possible to develop genital ulcers that are inflammatory, called aphthous ulcers. These can occur solely as a manifestation on the genitals or can be associated with a systemic inflammatory condition.
The appropriate next step would be to see your doctor for a physical examination.
If I can provide any additional information, please let me know.