Leg Rash Query

Patient: I have rash type lumps occurring down my legs, some of them leak fluid and they are itchy, painful and red. Some are darker purple. I have not eaten anything, or exposed my legs to anything out of the ordinary. I have tried taking anti-histamines and applying allergy creams but there has been no improvement. I have no known allergy’s and I am 100% sure they are not from ingrown hairs. I am very confused as to what this and is any advice on what they could be and treatments that are available would be greatly appreciated.