PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction GHK Cu injectable peptides are powerful tools for skin regeneration, recovery, and longevitybut local redness and irritation are common. Understanding why GHK Cu causes injection site reactions helps you use it more comfortably while maintaining Hard Lump Under Injection Site: Treatment, Causes, and More MyEczemaTeam Redness after a peptide injection can feel alarming but in most cases, its completely normal. , If youve noticed a pink or red halo at the injection site especially with peptides like GHK Cu