Unidentified Prepuce Condition: A Year of Misdiagnoses and Frustration - Dermatology

Unidentified preputial disease that multiple physicians are unable to diagnose?

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(I apologize, but please allow me to first explain this special feedback from a physician and the response from the Taiwan Dermatological Association, before introducing my symptoms:) I have had symptoms related to my foreskin since March of last year, and it has been over a year.
During this time, I have consulted four dermatologists and one urologist, each providing different diagnoses.
I have been prescribed and advised to use various medications and skincare products, but nothing has resolved the issue.
In fact, during my last visit to a major hospital, the physician examined me and surprisingly stated, "There is no disease; everything looks and feels normal," and added, "I studied medicine at National Taiwan University for seven years and have not learned about this in my further training.
The previous doctors probably haven't seen this either, so I can only randomly assign a diagnosis and prescribe medication to see if it works." He suggested that I consult a urologist instead, but the urologist also said there was no issue...
However, the symptoms are indeed present and have caused long-term inconvenience and discomfort in my daily life.
I determined that continuing to switch doctors randomly was not a solution and would only waste money, so I sought help from the Taiwan Dermatological Association, asking if they could refer my case of an unidentified skin condition that multiple doctors could not diagnose to a dermatology research unit willing to take it on as a study project.
Alternatively, I inquired if there were any better solutions or channels available.
However, the association replied, advising me to search online or continue seeing doctors (hoping for luck)...
But it is precisely because I have seen several doctors over the past year without success, and it is likely an unknown disease, that I had to seek other avenues! If I could resolve this issue by visiting a regular clinic or hospital, who wouldn't want that...
Then I stumbled upon the Taiwan e-Hospital website and decided to give it a try.
—————————————————— *Timeline and Symptoms: At the end of 2018, I began using a silicone masturbation cup heated in a rice cooker for 7 to 8 minutes, then cooled it down with cool water and water-based lubricant before use.
Until March 2019, there were no issues, but one day in March, it seemed that after using it for too long (I usually finish after two ejaculations, but that day I decided to go for three), I experienced a stinging sensation near the opening of the foreskin during the third round.
After resting for half a month, I tried again, but during the second round, the stinging sensation returned before I could finish.
I extended my rest period to one month and noticed that the opening of the foreskin had become very dry and tight; it could only retract below the glans when wet or with oily substances (like petroleum jelly).
After resuming masturbation, the stinging sensation returned, along with redness.
I then consulted the first doctor, who noted small abrasions and a bacterial infection, prescribing tetracycline eye ointment.
After using it for a month, I resumed masturbation, but the symptoms persisted.
He then suggested I try applying horse oil.
After three months of using horse oil without improvement, I consulted the second doctor, who diagnosed a fungal infection and prescribed Miconazole.
However, after applying it and resting for a month, there was still no improvement, and the symptoms had worsened to the point where even without masturbation, the retracted foreskin and the area where it was covered would occasionally feel a "pinching" stinging sensation (ranging from zero to a few times a day, to dozens of times a day).
The problematic foreskin near the opening had a different color and texture compared to the normal foreskin further back: it was darker, had many small, block-like folds, and when stretched flat, it reflected light more brightly.
After showering, it would turn red for a period.
In September, six months after the onset, I consulted the third doctor, who diagnosed seborrheic dermatitis and prescribed salicylic acid, a long-lasting moisturizing repair cream containing triple ceramides, and a soap-free cleanser for sensitive skin, advising me not to wash the foreskin with hot water or regular soap.
After following all instructions for a month, I suspected some improvement, so I tried using the masturbation cup with less force and at a slower pace, increasing the amount of lubricant and using it at room temperature without heating.
The first time, I only experienced mild irritation just before finishing the second ejaculation, and after cleaning and applying the repair cream and salicylic acid, the symptoms ceased to irritate or turn red shortly after.
I thought I had finally found the right treatment, but a few days later, when I masturbated again, the symptoms returned to their previous intensity.
In mid-October, I returned for a follow-up, and the doctor discontinued the salicylic acid, prescribing antifungal medication (I forgot if it was Miconazole).
In December, when I resumed masturbation, I again experienced the situation where "the first time the symptoms were mild, but a few days later, the second time was as severe as before," and this time, even parts of the glans and the urethral opening would turn red and have a different type of irritation (which felt more like sensitivity rather than pain, and was milder).
If I did not wear particularly soft underwear, even slight friction would easily cause sensitivity.
Additionally, if I did not retract the problematic foreskin but allowed it to cover the glans, I would easily experience a burning sensation when it came into contact with the scrotum; washing the foreskin with cool water or applying the repair cream would feel warm and cool in the healthy areas, but the problematic area would feel somewhat burning.
Since then, I have not dared to masturbate again and have continued to apply the repair cream as advised by the third doctor, using only the soap-free cleanser and cool water for washing, but there has been no improvement over the past few months.
I consulted the fourth (the aforementioned doctor from National Taiwan University) and fifth (urologist) doctors, and they both said there was no issue.
—————————————————— *Summary of Symptoms: The anterior foreskin is dry and tight, with many small block-like folds, reflecting light strongly when stretched flat.
It turns noticeably red during washing or masturbation (some areas are slightly red, while others are not), and friction easily causes stinging and sensitivity, with a burning sensation when in contact with cool water or room temperature repair cream.
*Summary of Medications and Products Used: Tetracycline eye ointment, salicylic acid, antifungal medications, pure horse oil, and triple ceramide moisturizing repair cream.
*Additionally, I emphasize: There is no itching, peeling, flaking, discharge, or rashes...
Thank you for taking the time to read this.
If a diagnosis cannot be determined, that is okay, but if possible, I hope you can provide other solutions or channels (such as recommending my case to a medical research unit).
Thank you!

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Guo Xiansheng, 20~29 year old female. Ask Date: 2020/05/10