Hydroxyurea and ankle ulcer

Has anyone had a painful ulcer (that won't heal) suddenly show up on your ankle, after taking Hydroxyurea? I was diagnosed with ET and had been taking HU (500/1000 mg on alternate days) for about 5 years. HU controlled my platelets well, but suddenly an ulcer showed up, that would not heal after 5.5 months (the last 6 weeks I received specialized wound care, without any benefit). I was not aware of any injury or insect bite; and diabetes, venal/arterial insufficiency, cancer, and infection were ruled out as possible causes. My online research revealed that such an ulcer is a documented side effect of HU (and that complete cessation of the HU was required to enable healing of the ulcer). However, my hematologist said my ulcer was almost certainly not a side effect of HU, because "such ulcers occur only very rarely and only at high dosages". Finally, in desperation, I quit the HU and within 1 week there were signs of healing, which has continued. Now I have to get a second opinion re: diagnosis and alternative treatments.