diff --git a/dnsapi/dns_lexicon.sh b/dnsapi/dns_lexicon.sh
index 9c0f9860..4ec1631d 100755
--- a/dnsapi/dns_lexicon.sh
+++ b/dnsapi/dns_lexicon.sh
@@ -7,12 +7,13 @@ lexicon_cmd="lexicon"
 
 wiki="https://github.com/Neilpang/acme.sh/wiki/How-to-use-lexicon-dns-api"
 
-_initLexicon() {
+_lexicon_init() {
   if ! _exists "$lexicon_cmd"; then
     _err "Please install $lexicon_cmd first: $wiki"
     return 1
   fi
 
+  PROVIDER="${PROVIDER:-$(_readdomainconf PROVIDER)}"
   if [ -z "$PROVIDER" ]; then
     PROVIDER=""
     _err "Please define env PROVIDER first: $wiki"
@@ -25,38 +26,42 @@ _initLexicon() {
   # e.g. busybox-ash does not know [:upper:]
   # shellcheck disable=SC2018,SC2019
   Lx_name=$(echo LEXICON_"${PROVIDER}"_USERNAME | tr 'a-z' 'A-Z')
+  eval $Lx_name="\${$Lx_name:-$(_readaccountconf_mutable $Lx_name)}"
   Lx_name_v=$(eval echo \$"$Lx_name")
   _secure_debug "$Lx_name" "$Lx_name_v"
   if [ "$Lx_name_v" ]; then
-    _saveaccountconf "$Lx_name" "$Lx_name_v"
+    _saveaccountconf_mutable "$Lx_name" "$Lx_name_v"
     eval export "$Lx_name"
   fi
 
   # shellcheck disable=SC2018,SC2019
   Lx_token=$(echo LEXICON_"${PROVIDER}"_TOKEN | tr 'a-z' 'A-Z')
+  eval $Lx_token="\${$Lx_token:-$(_readaccountconf_mutable $Lx_token)}"
   Lx_token_v=$(eval echo \$"$Lx_token")
   _secure_debug "$Lx_token" "$Lx_token_v"
   if [ "$Lx_token_v" ]; then
-    _saveaccountconf "$Lx_token" "$Lx_token_v"
+    _saveaccountconf_mutable "$Lx_token" "$Lx_token_v"
     eval export "$Lx_token"
   fi
 
   # shellcheck disable=SC2018,SC2019
   Lx_password=$(echo LEXICON_"${PROVIDER}"_PASSWORD | tr 'a-z' 'A-Z')
+  eval $Lx_password="\${$Lx_password:-$(_readaccountconf_mutable $Lx_password)}"
   Lx_password_v=$(eval echo \$"$Lx_password")
   _secure_debug "$Lx_password" "$Lx_password_v"
   if [ "$Lx_password_v" ]; then
-    _saveaccountconf "$Lx_password" "$Lx_password_v"
+    _saveaccountconf_mutable "$Lx_password" "$Lx_password_v"
     eval export "$Lx_password"
   fi
 
   # shellcheck disable=SC2018,SC2019
   Lx_domaintoken=$(echo LEXICON_"${PROVIDER}"_DOMAINTOKEN | tr 'a-z' 'A-Z')
+  eval $Lx_domaintoken="\${$Lx_domaintoken:-$(_readaccountconf_mutable $Lx_domaintoken)}"
   Lx_domaintoken_v=$(eval echo \$"$Lx_domaintoken")
   _secure_debug "$Lx_domaintoken" "$Lx_domaintoken_v"
   if [ "$Lx_domaintoken_v" ]; then
+    _saveaccountconf_mutable "$Lx_domaintoken" "$Lx_domaintoken_v"
     eval export "$Lx_domaintoken"
-    _saveaccountconf "$Lx_domaintoken" "$Lx_domaintoken_v"
   fi
 }
 
@@ -67,7 +72,7 @@ dns_lexicon_add() {
   fulldomain=$1
   txtvalue=$2
 
-  if ! _initLexicon; then
+  if ! _lexicon_init; then
     return 1
   fi
 
@@ -82,7 +87,7 @@ dns_lexicon_rm() {
   fulldomain=$1
   txtvalue=$2
 
-  if ! _initLexicon; then
+  if ! _lexicon_init; then
     return 1
   fi