A method of treating radiation-induced skin toxicity or skin ulcers with nanoparticles after exposure to ionizing radiation and after an onset of radiation-induced skin toxicity or a radiation-induced skin ulcer by administering intravenously a suspension including fibrinogen-coated albumin nanospheres to a patient. A concentration of the suspension being sufficient to at least one of promote healing of the skin toxicity or reduce a size of the skin ulcer. The suspension can include fibrinogen-coated albumin nanospheres, sorbitol and/or caprylate. The suspension can be utilized for treating a patient to reduce an amount of blood loss in an organ of the patient or for treating a patient to mobilize stem cells or progenitor cells to accelerate healing of a wound.