diff --git a/litellm/proxy/auth/user_api_key_auth.py b/litellm/proxy/auth/user_api_key_auth.py
index fb70426bd5..31395fe7da 100644
--- a/litellm/proxy/auth/user_api_key_auth.py
+++ b/litellm/proxy/auth/user_api_key_auth.py
@@ -579,7 +579,7 @@ async def _user_api_key_auth_builder(  # noqa: PLR0915
         elif api_key == "":
             # missing 'Bearer ' prefix
             raise Exception(
-                f"Malformed API Key passed in. Ensure Key has `Bearer ` prefix. Passed in: {passed_in_key}"
+                "Malformed API Key passed in. Ensure Key has `Bearer ` prefix."
             )
 
         if route == "/user/auth":
@@ -1237,7 +1237,7 @@ def get_api_key_from_custom_header(
         api_key = _get_bearer_token(api_key=custom_api_key)
         verbose_proxy_logger.debug(
             "Found custom API key using header: {}, setting api_key={}".format(
-                custom_litellm_key_header_name, api_key
+                custom_litellm_key_header_name, abbreviate_api_key(api_key)
             )
         )
     else: