Topical Pentoxifylline Gel on Behcet's Disease Oral Ulcers

Inclusion Criteria: * Meets the International Study Group criteria for Behcet's Disease * Presents with at least one active lesions accessible to measurement, the largest of which is to be designated as the index ulcer * Index oral ulcer to be assessed should be in the easily accessible areas of the oral mucosa, and the oral ulcer first began within 48 hrs prior to enrollment * Adult (\>18 years) male or a non-pregnant, non-lactating female * Has signed an Ethics Committee (EC) approved subject consent form * Has completed all screening procedures satisfactorily, is deemed to be an acceptable subject and is otherwise eligible for entry into the study * Is willing and able to comply with the protocol * Is being treated with colchicine Exclusion Criteria: * Has a severe, acute, or chronic systemic disease other than Behcet's Disease such as congestive heart failure, hepatic failure, renal failure, systemic lupus erythematosus, Stevens-Johnson syndrome, ulcerative colitis, cancer, leukemia, diabetes, AIDS, or any other condition that is severely compromising the immune system * Has received pentoxifylline in any form over the previous 60 days prior to enrollment * Has experienced recent cerebral and/or retinal hemorrhage or in patients who have previously exhibited intolerance to pentoxifylline or methylxanthines such as caffeine, theophylline, and theobromine * Has concomitant administration of strong CYP1A2 inhibitors (including e.g. ciprofloxacin or fluvoxamine) and other drugs that may increase the exposure to pentoxifylline * Is receiving immune suppressing or modulating therapy (e.g., apremilast) or topical corticosteroids within 2 weeks prior to enrollment * Is not being treated with colchicine * Is under active treatment for dental conditions, such that multiple dental office visits would be required during the study period, or presents with oral conditions which are not thought to be related to Behcet's Disease and in the judgment of a qualified dentist, will require treatment during the study period * Is suffering from any medical condition other than Behcet's Disease known to cause oral ulcerations, such as erosive lichen planus, benign mucous membrane pemphigoid, Systemic Lupus Erythematous, Crohn's disease, Reiter's syndrome, or AIDS. Has an eating disorder and/or psychiatric illness requiring treatment. Has a history of, or is currently exhibiting, any disease or condition, which, in the opinion of the principal investigator, would place the subject at increased risk during study therapy. Has any abnormality in hematological or biochemical variable, which, in the opinion of the principal investigator, would place the subject at increased risk during study therapy