Alternate oral regimens should be continued until all lesions have completely healed and include Doxycycline 100 mg twice a day for at least 3 weeks or TMP / SMX 160/800 mg twice a day for at least 3 weeks or Erythromycin 500 mg four times a day for at least 3 weeks IV or IM antibiotics (eg, ceftriaxone) are an alternative.