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There are several issues to consider in this situation.
The appearance of bites are may or may not be characteristic. However, the other major considerations when symptoms are persistent are whether there also is a secondary problem, such as a reaction to the bites or an infection.
If the only problem is persistent bites, that would usually indicate that there is ongoing bites, and the primary intervention is to control the environment or to prevent further bites. If you have already done simple environmental control interventions, then it may be necessary to consult a pest control company.
It also may help to use products that are designed to keep the bugs off you, such as Deet. However, there are also some hygiene products that may help with bugs and may be better tolerated, such as Avon Skin So Soft.
If there is a reaction, then Benadryl and steroids are the usual treatments, as you have already tried. If there is concern about an ongoing reaction to the bites despite the Benadryl and steroids, it may reuire a higher dose or longer course of the steroids.
If there is an infection and persistent, then it would typically require a course of oral antibiotics.
If I can provide any additional information, please let me know.