Erratum to: Arch Dermatol Res DOI 10.1007/s00403-011-1201-5

We regret that there was significant omission of doxycycline concentrations units in Abstract and Discussion sections of online published article. The units for both the low dose and high dose groups are as follows: 0.2 mg/L (0.45 μM) and 2.3 mg/L (5.18 μM).